Science Entry Examination Worksheet With Answers - Whitgift School Page 28
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50Whitgift School
Q13. Alex makes an electromagnet.
She winds insulated wire around an iron nail.
She connects the wire to a power supply.
She uses the electromagnet to pick up some steel paper-clips.
This is her prediction.
The more turns of wire around the iron nail the stronger
the electromagnet becomes.
(a)
(i)
Give the one factor she should change as she investigates her prediction.
.............................................................................................................
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1 mark
(ii)
Give one factor she should keep the same.
.............................................................................................................
.............................................................................................................
1 mark
(iii)
Describe how she could use the paper-clips to measure the
strength of the electromagnet.
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.............................................................................................................
1 mark
Whitgift School
| 13+ Science Examination - Sample Paper
28
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